Combined cup protector and casing cleaner for pump plungers



J. L. 503m. COMBINED CUP PROTECTOR. AND CASING CLEANER FOR PUMPPLUNGERS. APPLICATlON FILED MAY 19, 1921.

1 ,4214315, Patented Aug. 29, 1922.

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JOHN L. BOS'JIIC, OF WAINWRIGl-IT, OKLAI-IODIA, ASSIGNOR CHOKE-HALF TO INVADEB OIL CORPORATION, OF MUSKOGEE, OKLAHOMA. I

COMBINED CUP PROTECTOR AND CASING CLEANER FOR PUMP PLUNGEBS.

T all whom it may concern Be it known that 1, JOHN LEMUEL Bos'rro, citizen of the United States, residing at YVainwright, in the county of Muskogee and State of Oklahoma, have invented certain new and useful Improvements in Combined Cup Protectors and Casing Cleaners for Pump Plungers; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to an improved attachment for permanent connection to pump plungers, and it functions as a protector for the packing cups and also as a cleaner i for the pump barrel or casing.

l he principal object of the invention is to provide a device of this class designed to be permanently installed on the plunger between the usual check valve cage carried on the lower end of the sucker-rod, and the tubular piston which carries the packing cups, to serve as a protector for said cups and prevent sand trom depositing on or lodging be tween them and the inner wall of the working barrel and subjecting them and the casing to severe wear.

Another object of the invention is to provide'a device of this class which is preferably in the form of a brush the same being of agreater diameter than the internal diameter of the working barrel in which it is dis posed, thus causing the bristles to drag 011 the wall of the barrel during the up and down strokes of the sucker-rod to not only clean the inner wall of the barrel but to tightly engage the barrel and prevent sand from passing downwardly between the brush and the barrel and lodging on and between the cups and the barrel as now happens and greatly decreases the life of the cups.

Other objects and advantages of the invent-ion will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout the same:

Figure 1 is a central vertical sectional view of a portion of a conventional type of oil pump, embodying a cup protecting device constructed in accordance with this invention showing the position of the bristles of the brush on the upstroke of the pump.

Specification of Letters Patent. Patented Aug, 29, 1922,

Application fi1ed May 19,

1921. Serial No. 470,994.

Figure 2' is a view similar to Fig. 1 showing the position the bristles take on the down-stroke.

Figure 3 is an enlarged contral vertical sectional view through the cup protecting device.

Figure 4 is a top plan view thereof.

Specifically described, the cup protecting device comprises a tubular member I which is provided at its lower end with an enlarged internally screw-threaded coupling 2. Member l is externally screw-threaded at itsupper end as indicated at 3 and is provided intermediate its ends with aflange 4 constituting a shoulder. A brush 5 including a plurality of medium stiff bristles 6 and a central anchoring sleeve 6 to which the inner ends of the bristles are secured, this being accomplished in any-suitable or de sired way. The anchoring sleeve is removably fitted on the intermediate portion of the tubular memberl and rests on the upper face of the flange 4, being held in place by means of a washer 7 and clamping nut 8 which is threaded on the. screw-threaded portion 3 of this member. With this construction, it will be seen that/when the bristles of the brush become'worn badly, the brush can be removed from the tubular part 1 and replaced with a newone. a I

It has been before indicated that the pro tecting device is especially designed for use in oil wells. For this reason, I have shown a conventional type of oil well which among other parts embodies tubing A, a tubular cup carrying pipe or piston B, and a suckerrod C, on the lower end of which is a checkvalve and cage indicated by the letter D. As is usual, the upper end of the pipe of the piston B extends beyond the uppermost cup as indicated at E and the cage is formed in its lower end with a screw-threaded socket F.

As shown, my improved cup protecting device is interposed between the cage D and part B, the upper-screw-threaded endE being tapped into the screw-threaded socket F of the cage, while the coupling 2 is detachably connected with the projecting end E. It is to be pointed out here that the brush is of greater diameter than the internal diameter of the pump barrel Consequently, the outer ends of the bristles 6 drag on the inner wall of the casing during the up and down strokes of the sucker-rod C.

Hence, it will be seen that the operation of the pump will cause the brush to effectually clean the inner wall of'the barrel. Furthermore, owing to the large diameter of the brush, there is little or no possibility of the sand and grit, carried by the oil or other liquid, passing downwardly between the brush and inner wall of the barrel and lodging between or settling on the packing cups to cause excessive wear of the latter and easing as now occurs. Although the brush will contact the barrel wall sufiiciently tight to accomplish the above results, it will not interfere with the easy removal of the internal working parts of the pump from the casing. By forming the improved device of a tube, a combined conduit and coupling is provided which is designed for connection with the existing parts of the pumps shown and described without requiring any alterations thereof. It will also be found unnecessary to frequently remove said working parts of the pump after my improved cleaning device is installed. These and other advantages and features of the in vention, have, no doubt, become apparent from the foregoing description.

It is thought that a careful consideration of the description taken in connection with the drawings will be found sufiicient to enable persons skilled in the art to which the invention relates to obtain a clear understanding of the same. In View of this, a more lengthy and detailed description is deemed unnecessary.

In all probability, the device herein shown and described will accomplish effective results. For this reason, the form of the invention shown and described is taken as the preferred embodiment. However, slight minor changes in shape and size coming within the scope of the invention may be resorted to as long as no departure is made from the scope of the invention as claimed.

I claim:

1. A device of the class described comprising a combined coupling and conduit designed to be permanently installed in a pump plunger between the traveling valve cage and cup-carrying tube, and a cleaning device carried by said coupling.

2. A device of the class described comprising a tubular member for detachable connection to a check-valve cage and a tubular cup carrying pipe respectively, said member being provided with a shoulder, a brush including a central bristle-anchoringsleeve fitted on the intermediate portion of said member, and resting on said shoulder, and a clamping device for holding the brush in place.

In combination, a deep well casing, a plunger slidable therein and including a cage having a check-valve therein and a tubular cup-carrying member, and a brush constituting a combined casing cleaning and cup protecting device, said brush being of a greater diameter than the casing and being permanently connected with the plunger between said cage and the upper end of said cup-carrying member.

4. In combination, a well casing, a plunger slidable therein and including a cage having a check valve therein, and also including a tubular cup-carrying member, a tubular coupling connected at one of its ends to said member and at its opposite end with said cage, and a bristle brush fitted on the coupling, being of a diameter greater than the well casing to cause the outer ends of the bristles to drag against the inner surface of said casing for the purpose described.

In testimony whereof I have hereunto set my hand.

JOHN L. BOSTIC. 

